Antipick lock



Dec. 14, 1954 5 A 2,696,727

mmpxcx LOCK Filed Kay 2, 1951 IN V EN TOR.

p l: I Y' United States The present invention relates to an anti-picklock and It consists in the combinations, constructions and arrangementsof parts herein described and claimed.

uenerally there is provided a lock wherein is located a cylinder whichis revoluble by means of a key which is capable of moving a platetumbler having a laterally extending tooth at its outer end which toothis adapted to engage in a notch in a lever. A square pin is mounted inparallel relation to the axis of the cylinder and is carried by aradially extending arm which is atlixed to the cylinder. There is alsoprovided a lever having a gate n one end for the reception of the squarepin and there s also provided a pivotally mounted holding lever which 18normally spring-pressed toward the lever. "lhe construction is such thatwhen the cylinder is turned the tooth of the plate tumbler is removedfrom the notch in the lever making it impossible to move the latter andto reel out the gate therein if the square pin does not enter the same.

it is accordingly an object of the invention to provide a lock or' thecharacter set torth which is relatively simple in construction, easy tomanufacture and yet efiective and elrlclent in use.

Another ODJCI of the invention is to provide an antipiCK lock.

uiher and further objects of the invention will become apparent trom areading of the following specificatlon taken in con unction Wlul thedrawing, in which:

Figure l is a vertical longitudinal sectional view of an embodiment ofthe invention,

Figure 2 is a plan view thereof,

Figure 3 is a sectional view or Figure 1, showing the device with aproper key therein and in unlocked positlon,

Figure 4 is a sectional view taken along line 44 of Figure l with keyremoved showing the device in normal locked position,

Figure 5 is a view similar to Figures 3 and 4 but showing the devicewith a wrong key lnserted therein,

Figure 6 is a sectional view taken along line 66 of Figure l with keyremoved.

Figure 7 is a tragmentary vertical sectional view of a modincation oithe invention, and

Figure 8 is a sectional view taken along line 8-8 of Figure 7.

Ker'erring more particularly to the drawing, there is shown therein aconventional lock plate 10 having a slot 11.

The mechanism comprising the present invention is best illustrated inFigure 4 and consists of a cylinder 12 having a key slot 13. Thecylinder 12 is revolubly mounted in a block 25 attached by screws 28 tothe rear of the plate 10. Dlametrically disposed in the cylinder 12 andextending slidably upwardly therefrom is a plate tumbler 14 whose upperend has integrally tormed therewith a horizontally extending tooth 1:.'lhere is also provided a lever 10 having a horizontally extending gate16a in its upper portion and an interlocking notch 11 in its lowerportion. The lever 16 is pivotally mounted at its outer end upon a pin26 mounted in the blOCK. 25.

Amxed to the cylinder 121s a radially extending arm 18 to the outer endor which is anixed a pin '19 which extends in a direction parallel tothe axis or the cylinder 12 and which pin 19 1s prererably square incross sectional area. A holding lever 20 is plvotally mounted upon a pin21 carried by the block 2: ad acent the cylinder 12 and a spring 21. isattixed by a screw 27 to the block and bears against the outer side ofthe holding lever 20 and is adapted to urge the same toward the lever16.

A longitudinal groove 30 is formed in the block 25 immediately below anda like groove 31 immediately above the cylinder 12. A secondary tumbler32a of a ateht C ice length equal to the diameter of the cylinder 12 isslidably disposed in a diametrically extending slot 32 in the cylin der12 in longitudinal registry with the tumbler 14. The tumbler 32a 18likewise provided with a key slot.

It will be seen that the above-described mechanism may be repeated asmany times as desired, three repetitions being shown in the instantcase.

in operation, it will be apparent that when a proper key is insertedthrough the key slots in the elements 14 and 32a that firstly thesecondary tumblers 32a will be lifted so that their upper and lower endsregister with the adjacent peripheral edge of the cylinder 12 and out ofeither of the grooves 30 or 31. At the same time it will be noted thatthe tumblers 14 will be raised a proper height to allow the pin 19 toenter the gate 16a when the cylinder 12 is turned in a clockwisedirection as viewed, for example, in Figures 3 to 5, inclusive. At thistime, it will be noted that the holding lever 20 will act to maintainthe lever 16 in such lifted position during the turning of the cylinder12 as atoresaid. 1n the event that a ralse key be inserted through thevarious key slots, then in that event certain of the tumblers 14 willeither be raised too great a distance or be allowed to drop to animproper distance with relation, for example, to the center or thecylinder 12. in such case, as is well illustrated in Figure 5, one ormore of the levers 16 will have its gate 16a out of registry with thepin 19 and hence the pin 19 will be unable to enter the gate 16a of itsassociated lever 16, and, or course, it will be impossible to unlock thedevice. it will also be apparent that when the key is removed from thedevice it becomes impossible to feel out the gate 16a if the pin 19 isabutting against the free end or the lever 16 as shown in Figure 5. lnFigures 7 and 8 there is shown an identical construction with theexception that the key 36 shown therein is provided with teeth on bothof its edges instead or upon one edge as is shown in Figure l. Theoperation or this torm or the invention is identical with that abovedescribed, the elements 14 and 32a still being lifted to particularheights by the positioning of such key in the slots.

while but two tortns of the invention have been shown and describedherein, it will be readily apparent to those skilled in the art thatmany minor modincatlons may be made without departing rrom the spirit ofthe invention or the scope or the appended claims.

What is claimed is:

1. A device or the character described comprising a block, a cylinderrevoluoly mounted in said block, said blOCK having a longitudinal grooveimmediately above and a like groove immediately oelow said cylinder, ahrst tumbler diametrically disposed and vertically slidable in saidcylinder and extending upwardly therefrom, a laterally extending toothahixed to the upper end of said first tumbler, a lever pivoted at one orits ends to said block and having an inwardly extending gate formed inthe upper portion of its other end and a notch for receiving said toothin the lower portion of said other end, a secondary tumbler of a lengthequal to the diameter of said cylinder diametrically slidaole in saidcylinder in longitudinal reglstry with said first tumbler, said tumblerseach provided with a key slot, a longitudinally extending pin carriedfixedly by said cylinder in spaced relation thereto and receivable insaid gate when said lever is raised to proper height, and yieldablemeans for maintaining said lever in raised position.

2. A device as defined in claim 1 wherein there is provided multiples ofthe lever and tumblers.

3. A device as defined in claim 1 wherein said means comprises an armpivoted to said block and having its free end disposed to abut the freeend of said lever, and a spring atlixed to said block and bearingagainst said arm to urge the same into such abutting relationship withsaid lever.

References Cited in the file of this patent UNITED STATES PATENTS Number

